test/hotspot/jtreg/gc/arguments/TestG1PercentageOptions.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/*
 * @test TestG1PercentageOptions
 * @key gc
 * @bug 8068942
 * @requires vm.gc.G1
 * @summary Test argument processing of various percentage options
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run driver TestG1PercentageOptions
 */

import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;

public class TestG1PercentageOptions {

    private static final class OptionDescription {
        public final String name;
        public final String[] valid;
        public final String[] invalid;

        OptionDescription(String name_, String[] valid_, String[] invalid_) {
            name = name_;
            valid = valid_;
            invalid = invalid_;
        }
    }

    private static final String[] defaultValid = new String[] {
        "0", "1", "50", "95", "100" };
    private static final String[] defaultInvalid = new String[] {
        "-10", "110", "bad" };

    // All of the G1 product arguments that are percentages.
    private static final OptionDescription[] percentOptions = new OptionDescription[] {
        new OptionDescription("G1ConfidencePercent", defaultValid, defaultInvalid)
        // Other percentage options are not yet validated by argument processing.
    };

    private static void check(String flag, boolean is_valid) throws Exception {
        String[] flags = new String[] { "-XX:+UseG1GC", flag, "-version" };
        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(flags);
        OutputAnalyzer output = new OutputAnalyzer(pb.start());
        if (is_valid) {
            output.shouldHaveExitValue(0);
        } else {
            output.shouldHaveExitValue(1);
        }
    }

    private static
    void check(String name, String value, boolean is_valid) throws Exception {
        check("-XX:" + name + "=" + value, is_valid);
    }

    public static void main(String args[]) throws Exception {
        for (OptionDescription option : percentOptions) {
            for (String value : option.valid) {
                check(option.name, value, true);
            }
            for (String value : option.invalid) {
                check(option.name, value, false);
            }
            check("-XX:" + option.name, false);
            check("-XX:+" + option.name, false);
            check("-XX:-" + option.name, false);
        }
    }
}